Repeated migration of a fusion cage after posterior lumbar interbody fusion.

Although posterior lumbar interbody fusion (PLIF) is a widely accepted procedure, perioperative and postoperative complications are still encountered. In particular, cage migration can result in severe sequelae, and revision surgery is technically demanded. Here, we report a rare case of repeated migration of a fusion cage after PLIF. To the best of our knowledge, no report has been previously issued on repeated migration of a fusion cage after PLIF. The authors discuss the radiological and clinical findings of this unusual complication with a review of the literature.